21=-3(k-8)

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Solution for 21=-3(k-8) equation: 


Simplifying
21 = -3(k + -8)

Reorder the terms:
21 = -3(-8 + k)
21 = (-8 * -3 + k * -3)
21 = (24 + -3k)

Solving
21 = 24 + -3k

Solving for variable 'k'.

Move all terms containing k to the left, all other terms to the right.

Add '3k' to each side of the equation.
21 + 3k = 24 + -3k + 3k

Combine like terms: -3k + 3k = 0
21 + 3k = 24 + 0
21 + 3k = 24

Add '-21' to each side of the equation.
21 + -21 + 3k = 24 + -21

Combine like terms: 21 + -21 = 0
0 + 3k = 24 + -21
3k = 24 + -21

Combine like terms: 24 + -21 = 3
3k = 3

Divide each side by '3'.
k = 1

Simplifying
k = 1

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